package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result senddCode(String phone, HttpSession session) {
        //1，校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        //2, 生成验证码
        String code = RandomUtil.randomNumbers(6);
        //3，保存验证码到redis
//        session.setAttribute("code",code);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY +phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //4，发送验证码 //TODO 短信服务发送验证码
        log.debug("发送短信验证码成功，验证码：{}",code);
        //5，返回
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        String code = loginForm.getCode();

//        Object cacheCode = session.getAttribute("code");
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);

        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        if (cacheCode == null || !cacheCode.equals(code)){
            return Result.fail("验证码错误");
        }
        //phone -> DB User
        User user = query().eq("phone", phone).one();
        if (user == null) {
            user = createUserWithPhone(phone);
        }
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        String token = UUID.randomUUID().toString(true);
        String tokenKey = LOGIN_USER_KEY + token;
        Map<String, Object> stringObjectMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((fildName,fildValue)->fildValue.toString()));
        stringRedisTemplate.opsForHash().putAll(tokenKey,stringObjectMap);
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
//        session.setAttribute("user", userDTO);
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        Long userId = UserHolder.getUser().getId();
        LocalDate now = LocalDate.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDate now = LocalDate.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        //bitfield sign:1010:202402 get u30 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long number = result.get(0);
        if (number == null || number == 0){
            return Result.ok(0);
        }
        int count = 0;
        while (true){
            if ((number & 1) == 0){
                break;
            }else {
                count++;
            }
            number >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX +RandomUtil.randomString(10));
        boolean save = save(user);
        return user;
    }
}
